Central A/C turns off every night at midnight?

Hi,
My central A/C has a problem where every night around midnight it seems to turn off and not respond to the thermostats call to turn on. I end up waking up every night around 12:30 very hot, walk to the thermostat (which is set to 73 deg. and AUTO), see that it is calling for cooling but that nothing is happening. I move the switch from AUTO to FAN and I start to get some air blowing into the room which is enough to help with the temperature and I fall back asleep.
Any idea what is going on? I've checked the programming of the thermostat and it seems fine. The A/C system works perfectly over the course of the day. I only have this one issue every single night around midnight.

Central A/C turns off every night at midnight?

Central A/C turns off every night at midnight?

How old is the thermostat?
Far stretch....but
I know there were Y2k problems with some - & they failed at midnight
There are also all sorts of "trip dates" (failure) since Y2K
But I couldn't find one for 2008, for 2009 next one is 09/09/09

Central A/C turns off every night at midnight?

Investigation is still in process. I did set the thermostat to "manual" last night at a constant temperature. That succeeded in keeping the room cool. Next step is to figure out why it doesn't function properly in "Auto" mode. May just be a defective thermostat that needs to be replaced.

Central A/C turns off every night at midnight?

Quote:

Originally Posted by RKDuke

Investigation is still in process. I did set the thermostat to "manual" last night at a constant temperature. That succeeded in keeping the room cool. Next step is to figure out why it doesn't function properly in "Auto" mode. May just be a defective thermostat that needs to be replaced.